(svn r13674) -Fix [FS#2127]: crash when drawing a non-real sprite. The drawing of the non-real sprite is caused when two NewGRFs replace the same sprite and the first replaces it with a real sprite (and thus assumes it remains a real sprite) and the second replaces it with a non-real sprite. OpenTTD already looked at whether the sprite to load should be seen as a real or non-real sprite, but it failed to replace non-real sprites with a substitute real sprite when getting the sprite from the cache.

/* $Id$ */

/** @file signs_func.h Functions related to signs. */

#ifndef SIGNS_FUNC_H
#define SIGNS_FUNC_H

#include "signs_type.h"

extern SignID _new_sign_id;
extern bool _sign_sort_dirty;

void UpdateAllSignVirtCoords();
void PlaceProc_Sign(TileIndex tile);

/* signs_gui.cpp */
void ShowRenameSignWindow(const Sign *si);
void HandleClickOnSign(const Sign *si);

void ShowSignList();

#endif /* SIGNS_FUNC_H */